﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace answer1
{
    class Solution
    {
        public static void  Main()
        {
            Console.WriteLine("please input month");
            int month = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("rabbit numbers is "+ CaluCountsForMonth(month));
        }
        public static int CaluCountsForMonth(int month)
        {
            if(month > 2)
            {
                return CaluCountsForMonth(month - 1) + CaluCountsForMonth(month - 2);
            }
            return 1;
        }
    }
}